C1418 I've Taken a Fancy to Her!
Yu Qing didn't have much to do every day, so he followed behind Sung Zhu every day. Wherever Sung Zhu went, he followed.
If she didn't know Yu Qing's identity at the beginning, Sung Zhu would naturally not agree. However, now that she knew, she also knew that Yu Qing wouldn't have any other thoughts about her, so she silently agreed to Yu Qing's actions
